ethyl 3-methyl-4-hydroxy-5-tert-butylbenzofuran-2-carboxylate 、
4-氯苯甲酰氯 、
三氯化铝 、
盐酸 在
二氯甲烷 、
水 、
Sodium sulfate-III 、
ethyl 3-methyl-4-hydroxy-5-tert-butyl-7-p-chlorobenzoylbenzofuran-2-carboxylate 作用下,
以
1,2-二氯乙烷 为溶剂,
反应 3.5h,
以afforded ethyl 3-methyl-4-hydroxy-5-tert-butyl-7-p-chlorobenzoylbenzofuran-2-carboxylate, compound 17 as an oil sufficiently pure for further chemistry的产率得到ethyl 3-methyl-4-hydroxy-5-tert-butyl-7-p-chlorobenzoylbenzofuran-2-carboxylate